Large two-stroke diesel engine with electronically controlled exhaust valve actuation system

A diesel engine and actuation system technology, applied to engine components, combustion engines, machines/engines, etc., can solve problems such as expensive structure, complex hydraulic system, etc.

Inactive Publication Date: 2011-02-09
曼能解决方案(曼能解决方案德国股份公司)分公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydraulic system is relatively complex, and the structure of the gas spring and hydraulic actuator at the top of the valve stem is significantly different from the corresponding structure in a conventional camshaft engine
Therefore, this prior art structure is relatively expensive and complex

Method used

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  • Large two-stroke diesel engine with electronically controlled exhaust valve actuation system
  • Large two-stroke diesel engine with electronically controlled exhaust valve actuation system
  • Large two-stroke diesel engine with electronically controlled exhaust valve actuation system

Examples

Experimental program
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Embodiment Construction

[0027] figure 1 and figure 2 An engine 1 according to a preferred embodiment of the invention (for one cylinder) is shown in cross-section and longitudinal section, respectively. The engine 1 is a crosshead single-flow low-speed two-stroke crosshead diesel engine, which can be a propulsion system in a ship or a prime mover in a power station. These engines typically have four to fourteen cylinders in a row. The engine 1 is built from a foundation 2 with main bearings for a camshaft 3 .

[0028] Camshaft 3 is semi-combined. The semi-unit is made of a forged or cast steel crank connected to the main journal by a shrink fit connection.

[0029] The base 2 can be manufactured in one piece or divided into several parts with suitable dimensions according to the production equipment. The base includes side walls and welded beams with bearing supports. This beam is also known in the field as a "transverse beam". An oil pan 58 is welded to the bottom of the base 2 and collects ...

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PUM

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Abstract

A large two-stroke diesel engine with an electronically controlled exhaust valve actuation system includes for each cylinder an exhaust valve with a valve stem and a valve disc, an air spring operably connected to the valve stem and urging the exhaust valve towards the closed position, a hydraulic actuator operably connected to the exhaust valve, an electronically controlled hydraulic system thatselectively connects the hydraulic actuator to a source of high pressure hydraulic fluid for a first short period at the start of the opening stroke of the exhaust valve, and an intermediate pressurehydraulic accumulator for a period immediately following the first short period until the exhaust valve has reached it open position, the intermediate pressure hydraulic accumulator from the start ofthe closing stroke of the exhaust valve until the start of a last short period at the end of the closing stroke of the exhaust valve, and to tank during the last short period of the closing stroke ofthe exhaust valve.

Description

technical field [0001] The present invention relates to a crosshead type large two-stroke diesel engine with an electronically controlled exhaust valve actuating system, in particular to a crosshead type large two-stroke diesel engine with an energy-saving electronically controlled exhaust valve actuating system engine. Background technique [0002] Large crosshead two-stroke diesel engines, commonly used in the propulsion systems of large ships or as prime movers in power stations, have recently evolved from camshaft controlled engines to electronically controlled engines. Electronic control provides instant flexibility in the timing and shaping of fuel injection and in the timing of the exhaust valve. This enables better control of the combustion process, more efficient combustion and lower emission values ​​at full speed, reduced fuel consumption at part load and reduced minimum operating speeds. [0003] JP2004-084670 discloses a large electronically controlled two-str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L9/02F01L9/10
CPCY02T10/146F01L1/465F01L2001/34446F16C5/00F01L9/02F02B2075/025F16C2360/22F01L9/10
Inventor 埃里克·罗森隆德
Owner 曼能解决方案(曼能解决方案德国股份公司)分公司
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